I-beam mast



FIG. 1 is a perspective view of an I-beam mast, showing my new design in an extended position;

FIG. 2 is a perspective view thereof, illustrated in a collapsed position;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right-side view thereof, illustrated in the collapsed position;

FIG. 6 is a bottom plan view thereof, illustrated in the collapsed position;

FIG. 7 is a rear view thereof, illustrated in the collapsed position; and,

FIG. 8 is a right-side elevational view thereof, illustrated in the collapsed position and as in use on a vehicle.

The broken lines showing a truck and drilling equipment in FIG. 8 are included for the purpose of illustrating the invention in use, and form no part of the claimed design. 

I claim the ornamental design for an I-beam mast, as shown and described. 